Add 3D printing files to download extensions #6762

Job	Run time
PHP (UnitTests, 7.2, Mysql, PDO_MYSQL)	2m 32s
Client	1m 21s
PHP (UnitTests, 8.2, Mariadb, PDO_MYSQL)	3m 20s
PHP (UnitTests, 8.4, Mysql, MYSQLI)	1m 44s
Javascript	3m 32s
PHP (SystemTestsPlugins, 7.2, Mysql, PDO_MYSQL)	12m 50s
PHP (SystemTestsPlugins, 8.2, Mariadb, PDO_MYSQL)	12m 16s
PHP (SystemTestsPlugins, 8.4, Mysql, MYSQLI)	15m 25s
UI (0)	31m 49s
PHP (SystemTestsCore, 7.2, Mysql, PDO_MYSQL)	7m 44s
UI (1)	17m 18s
PHP (SystemTestsCore, 8.2, Mariadb, PDO_MYSQL)	9m 5s
UI (2)	17m 59s
PHP (SystemTestsCore, 8.4, Mysql, MYSQLI)	10m 21s
UI (3)	15m 56s
PHP (IntegrationTestsCore, 7.2, Mysql, PDO_MYSQL)	12m 49s
PHP (IntegrationTestsCore, 8.2, Mariadb, PDO_MYSQL)	12m 28s
PHP (IntegrationTestsCore, 8.4, Mysql, MYSQLI)	14m 20s
PHP (IntegrationTestsPlugins, 7.2, Mysql, PDO_MYSQL)	29m 32s
PHP (IntegrationTestsPlugins, 8.2, Mariadb, PDO_MYSQL)	27m 17s
PHP (IntegrationTestsPlugins, 8.4, Mysql, MYSQLI)	36m 33s
	4h 56m 11s

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